CN108892751B - Preparation method and application of sodium carboxymethylcellulose-diketene graft copolymer - Google Patents
Preparation method and application of sodium carboxymethylcellulose-diketene graft copolymer Download PDFInfo
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- CN108892751B CN108892751B CN201810570358.6A CN201810570358A CN108892751B CN 108892751 B CN108892751 B CN 108892751B CN 201810570358 A CN201810570358 A CN 201810570358A CN 108892751 B CN108892751 B CN 108892751B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
- C08F251/02—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof on to cellulose or derivatives thereof
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/52—Cellulose; Derivatives thereof
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
- D21H21/20—Wet strength agents
Abstract
The invention provides a preparation method and application of a sodium carboxymethylcellulose-diketene graft copolymer, which comprises the following steps of dissolving carboxymethylcellulose: dissolving carboxymethyl cellulose in water; condensing and refluxing: under the protection of inert gas, carrying out condensation reflux; adding an initiator: adding initiator potassium persulfate and sodium bisulfite; grafting monomer: adding monomer diketene and reacting. The prepared modified sodium carboxymethyl cellulose has high activity because the accessed acetoacetic acid group is influenced by electron withdrawing of two carbonyl groups due to the middle methylene group, so that the modified sodium carboxymethyl cellulose can be used as various additives. The sodium carboxymethylcellulose-diketene graft copolymer prepared by the invention can be used as a papermaking reinforcing agent, a sizing agent and a coating adhesive.
Description
Technical Field
The invention belongs to the technical field of carboxymethyl cellulose modification, and particularly relates to a preparation method and application of a sodium carboxymethyl cellulose-diketene graft copolymer.
Background
Carboxymethyl cellulose (CMC) is a water-soluble cellulose ether compound, which is generated by alkalization and etherification reactions of natural cellulose serving as a basic raw material and is a derivative with an ether structure obtained by chemical modification of the natural cellulose. Carboxymethyl cellulose is obtained after carboxymethylation of cellulose, and an aqueous solution of the carboxymethyl cellulose has the effects of thickening, film forming, adhesion, water retention, colloid protection, emulsification, suspension and the like, is widely applied to industries such as petroleum, food, medicine, textile, paper making and the like, and is one of the most important cellulose ethers.
The carboxymethyl cellulose has simple preparation process and industrial production, so that the raw materials are easy to obtain. The graft polymerization of the aqueous solution is easy to carry out due to the excellent water solubility, and the uniformity of the reaction is ensured, so that the problems of heterogeneous reaction caused by using other celluloses, pollution caused by using other solvents and cost increase are solved. Meanwhile, the carboxymethyl cellulose graft copolymerization is an important chemical method in the high polymer modification technology, and has the advantages that the grafting is implemented with less strict technical requirements, so the cost is much lower. In addition, the technical scheme of grafting can be changed to be multiterminal enough to adapt to various modification purposes and enable the product to meet different purposes. Therefore, the research on the graft copolymerization of the carboxymethyl cellulose has wide development prospect and practical significance.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
Therefore, in one aspect of the present invention, the present invention overcomes the disadvantages of the prior art, and provides a method for preparing a sodium carboxymethylcellulose-diketene graft copolymer.
In order to solve the technical problems, the invention provides the following technical scheme: a preparation method of a sodium carboxymethylcellulose-diketene graft copolymer comprises the following steps of dissolving carboxymethylcellulose: dissolving carboxymethyl cellulose in water; condensing and refluxing: under the protection of inert gas, carrying out condensation reflux; adding an initiator: adding initiator potassium persulfate and sodium bisulfite; grafting monomer: adding monomer diketene and reacting.
As a preferred scheme of the preparation method of the sodium carboxymethylcellulose-diketene graft copolymer, the method comprises the following steps: dissolving carboxymethyl cellulose, namely dissolving 2.5g of carboxymethyl cellulose in 500mL of water, and rapidly stirring to dissolve the carboxymethyl cellulose at the temperature of 50-60 ℃.
As a preferred scheme of the preparation method of the sodium carboxymethylcellulose-diketene graft copolymer, the method comprises the following steps: dissolving the carboxymethyl cellulose, and adjusting the pH value to 7-8 after dissolving the carboxymethyl cellulose in water.
As a preferred scheme of the preparation method of the sodium carboxymethylcellulose-diketene graft copolymer, the method comprises the following steps: the condensing reflux, wherein the inert gas comprises nitrogen.
As a preferred scheme of the preparation method of the sodium carboxymethylcellulose-diketene graft copolymer, the method comprises the following steps: the initiator is added, wherein the mass ratio of potassium persulfate: sodium bisulfite ═ 2:1 to 4.
As a preferred scheme of the preparation method of the sodium carboxymethylcellulose-diketene graft copolymer, the method comprises the following steps: and adding an initiator, wherein the reaction temperature is 35-45 ℃, and the addition amount of the initiator is 0.01g of the initiator added to every 2.5g of the carboxymethyl cellulose.
As a preferred scheme of the preparation method of the sodium carboxymethylcellulose-diketene graft copolymer, the method comprises the following steps: the grafting monomer comprises monomer diketene of 0.5-1.0 g added into 2.5g of carboxymethyl cellulose, the reaction temperature is 35-45 ℃, and the reaction lasts for 3-4 h at the rotating speed of 100-200 rpm.
As a preferred scheme of the preparation method of the sodium carboxymethylcellulose-diketene graft copolymer, the method comprises the following steps: and further comprising the steps of cooling to room temperature after the grafting monomer reaction is finished, washing with ethanol, carrying out vacuum filtration, washing again with deionized water, and drying.
As another aspect of the invention, the invention overcomes the defects in the prior art and provides the application of the carboxymethylcellulose sodium-diketene graft copolymer.
In order to solve the technical problems, the invention provides the following technical scheme: use of a sodium carboxymethylcellulose-diketene graft copolymer, wherein: the sodium carboxymethylcellulose-diketene graft copolymer can be used as a papermaking reinforcing agent, a sizing agent and a coating adhesive.
The invention has the beneficial effects that: the prepared modified sodium carboxymethyl cellulose has high activity because the accessed acetoacetic acid group is influenced by electron withdrawing of two carbonyl groups due to the middle methylene group, so that the modified sodium carboxymethyl cellulose can be used as various additives. The invention can be used as sizing material and reinforcing agent in paper industry, can increase filler retention, can be compounded with other sizing agents to prepare surface sizing of paper, and can obviously improve the dry strength, wet strength, oil resistance, ink absorption and water resistance of the paper. When the invention is used as a papermaking reinforcing agent, the combination quantity of hydrogen bonds in the intersection area of the fibers is greatly increased due to the bridging capacity of the connected acetoacetic acid groups in the product. Because a large amount of hydroxyl in the cellulose can enable the product to be firmly adsorbed on the fiber, the hydroxyl of the cellulose and the hydroxyl on the surface of the fiber form hydrogen bonds, and the bonding strength inside the fiber is increased. The invention is added into the pulp to contact with aluminum sulfate in the pulp to precipitate on the fiber, which is helpful for improving the dry strength of paper and improving the retention of fine fiber and the dehydration of paper. The rosin size can be compounded in the paper making industry to be used for paper sizing, namely the rosin size can be used as an auxiliary emulsifier to improve the stability of the rosin size, and the rosin size emulsion can not deteriorate and precipitate in summer when the water temperature is higher. When the product is used for sizing for papermaking, a tough coating film which can not penetrate grease can be generated on a paper surface, air holes of the paper can be obviously reduced, and the product is particularly suitable for surface sizing of oilproof paper, wax paper and the like. When the invention is used as a papermaking coating adhesive, the grafted acetoacetic acid radical plays a role in bonding pigment particles and pigment and base paper, thereby improving the rheological property and stability of the coating, controlling the absorptivity of the coating to ink and improving the gloss of a printing surface.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
FIG. 1 is a graph comparing paper made according to the prior art process (left panel) with paper made according to the present invention with modified CMC added (right panel).
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with examples are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1:
adding 600mL of deionized water into a beaker, placing the beaker on a magnetic stirrer for rapid stirring, and heating the beaker to 50-60 ℃. 2.5g of CMC powder is weighed and added into a beaker, and stirred for 2.5h at high speed until the CMC is completely dissolved. After complete dissolution, the solution is cooled to room temperature, and the pH of the solution is adjusted to 7.0-8.0 by using dilute hydrochloric acid. Transferring the CMC solution to a four-mouth bottle, putting the bottle into an oil bath pot, adding a condensation reflux device, and adding a solvent into the oil bath pot, wherein the solvent is N2Stirring for 30 minutes under protection. Adding K when the temperature reaches 35 DEG C2S2O8/NaHSO3Redox initiator 0.01g (K)2S2O8:NaHSO32: 1). Both are prepared into aqueous solution and are slowly dripped by a constant pressure funnel. After stirring for 10 minutes, 0.5g of the grafting monomer diketene was added. The reaction is carried out at a temperature of 35 ℃ and a rotation speed of 100 to 200rpm for 3 hours. After the reaction is finished, cooling the liquid to room temperature, repeatedly washing with ethanol, carrying out vacuum filtration, washing again with deionized water, and drying in an oven at a constant temperature of 60 ℃ to constant weight to obtain a crude product of the graft copolymer.
Example 2:
adding 600mL of deionized water into a beaker, placing the beaker on a magnetic stirrer for rapid stirring, and heating the beaker to 50-60 ℃. 2.5g of CMC powder is weighed and added into a beaker, and stirred for 2.5h at high speed until the CMC is completely dissolved. After complete dissolution, the solution is cooled to room temperature, and the pH of the solution is adjusted to 7.0-8.0 by using dilute hydrochloric acid. Transferring the CMC solution to a four-mouth bottle, putting the bottle into an oil bath pot, adding a condensation reflux device, and adding a solvent into the oil bath pot, wherein the solvent is N2Stirring for 30 minutes under protection. Adding K when the temperature reaches 45 DEG C2S2O8/NaHSO3Redox initiator 0.01g (K)2S2O8:NaHSO32: 1). Both are prepared into aqueous solution and are slowly dripped by a constant pressure funnel. After stirring for 10 minutes, 0.5g of the grafting monomer diketene was added. The reaction is carried out at a temperature of 45 ℃ and a rotation speed of 100 to 200rpm for 4 hours. After the reaction is finished, cooling the liquid to room temperature, repeatedly washing with ethanol, carrying out vacuum filtration, washing again with deionized water, and drying in an oven at a constant temperature of 60 ℃ to constant weight to obtain a crude product of the graft copolymer.
Example 3:
adding 600mL of deionized water into a beaker, placing the beaker on a magnetic stirrer for rapid stirring, and heating the beaker to 50-60 ℃. 2.5g of CMC powder is weighed and added into a beaker, and stirred for 2.5h at high speed until the CMC is completely dissolved. After complete dissolution, the solution is cooled to room temperature, and the pH of the solution is adjusted to 7.0-8.0 by using dilute hydrochloric acid. Transferring the CMC solution to a four-mouth bottle, putting the bottle into an oil bath pot, adding a condensation reflux device, and adding a solvent into the oil bath pot, wherein the solvent is N2Stirring for 30 minutes under protection. Adding K when the temperature reaches 45 DEG C2S2O8/NaHSO3Redox initiator 0.01g (K)2S2O8:NaHSO32: 1). Both are prepared into aqueous solution and are slowly dripped by a constant pressure funnel. After stirring for 10 minutes, 0.75g of the grafting monomer diketene was added. The reaction is carried out at a temperature of 45 ℃ and a rotation speed of 100 to 200rpm for 4 hours. After the reaction is finished, cooling the liquid to room temperature, repeatedly washing with ethanol, carrying out vacuum filtration, washing again with deionized water, and drying in an oven at a constant temperature of 60 ℃ to constant weight to obtain a crude product of the graft polymer.
Example 4:
in a beakerAdding 600mL of deionized water, placing on a magnetic stirrer for rapid stirring, and heating to 50-60 ℃. Weighing 2.5g of CMC powder, adding into a beaker, and stirring at high speed for 2 hours until the CMC is completely dissolved. After complete dissolution, the solution is cooled to room temperature, and the pH of the solution is adjusted to 7.0-8.0 by using dilute hydrochloric acid. Transferring the CMC solution to a four-mouth bottle, putting the bottle into an oil bath pot, adding a condensation reflux device, and adding a solvent into the oil bath pot, wherein the solvent is N2Stirring for 30 minutes under protection. Adding K when the temperature reaches 45 DEG C2S2O8/NaHSO3Redox initiator 0.01g (K)2S2O8:NaHSO31: 1). Both are prepared into aqueous solution and are slowly dripped by a constant pressure funnel. After stirring for 10 minutes, 0.75g of the grafting monomer diketene was added. The reaction is carried out at a temperature of 45 ℃ and a rotation speed of 100 to 200rpm for 5 hours. After the reaction is finished, cooling the liquid to room temperature, repeatedly washing with ethanol, carrying out vacuum filtration, washing again with deionized water, and drying in an oven at a constant temperature of 60 ℃ to constant weight to obtain a crude product of the graft copolymer.
Example 5:
adding 600mL of deionized water into a beaker, placing the beaker on a magnetic stirrer for rapid stirring, and heating the beaker to 50-60 ℃. 2.5g of CMC powder is weighed and added into a beaker, and stirred for 2.5h at high speed until the CMC is completely dissolved. After complete dissolution, the solution is cooled to room temperature, and the pH of the solution is adjusted to 7.0-8.0 by using dilute hydrochloric acid. Transferring the CMC solution to a four-mouth bottle, putting the bottle into an oil bath pot, adding a condensation reflux device, and adding a solvent into the oil bath pot, wherein the solvent is N2Stirring for 30 minutes under protection. Adding K when the temperature reaches 45 DEG C2S2O8/NaHSO3Redox initiator 0.01g (K)2S2O8:NaHSO31: 2). Both are prepared into aqueous solution and are slowly dripped by a constant pressure funnel. After stirring for 10 minutes, 0.75g of the grafting monomer diketene was added. The reaction is carried out at a temperature of 45 ℃ and a rotation speed of 100 to 200rpm for 4 hours. After the reaction is finished, cooling the liquid to room temperature, repeatedly washing with ethanol, carrying out vacuum filtration, washing again with deionized water, and drying in an oven at a constant temperature of 60 ℃ to constant weight to obtain a crude product of the graft copolymer.
Example 6:
600mL of deionized water was added to the beaker,quickly stirring the mixture on a magnetic stirrer, and heating the mixture to 50-60 ℃. 2.5g of CMC powder is weighed and added into a beaker, and stirred for 2.5h at high speed until the CMC is completely dissolved. After complete dissolution, the solution is cooled to room temperature, and the pH of the solution is adjusted to 7.0-8.0 by using dilute hydrochloric acid. Transferring the CMC solution to a four-mouth bottle, putting the bottle into an oil bath pot, adding a condensation reflux device, and adding a solvent into the oil bath pot, wherein the solvent is N2Stirring for 30 minutes under protection. Adding K when the temperature reaches 45 DEG C2S2O8/NaHSO3Redox initiator 0.01g (K)2S2O8:NaHSO31: 2). Both are prepared into aqueous solution and are slowly dripped by a constant pressure funnel. After stirring for 10 minutes, 1.0g of the grafting monomer diketene was added. The reaction is carried out at a temperature of 45 ℃ and a rotation speed of 100 to 200rpm for 4 hours. After the reaction is finished, cooling the liquid to room temperature, repeatedly washing with ethanol, carrying out vacuum filtration, washing again with deionized water, and drying in an oven at a constant temperature of 60 ℃ to constant weight to obtain a crude product of the graft copolymer.
Example 7:
the application of the method in papermaking comprises the following steps:
1. as a reinforcing agent
The samples prepared in the examples 1 to 6 are respectively marked as samples 1 to 6, and the product is added in the papermaking process to be compared with reinforcing agents such as modified starch, Cationic Polyacrylamide (CPAM) and the like, wherein the adding amount is 1 percent. The partial strength indexes of the sheets measured after the formation are shown in the following table.
TABLE 1 partial paper strengthening index of the product and other strengthening agents
The quantitative determination of the paper is carried out according to the national standard (GB/T451.2-1989).
The tensile strength of the paper is measured by means of a Schopper-type pendulum tensile machine, and the tensile strength data are processed according to the national standard (GB/T453-1989).
The paper tear was measured according to the Elmendorf Type tear tester specified in the national Standard (GB/T455.1-1989).
The paper bursting strength was measured using a bursting strength tester of the Lomb (Mullen) type, and the data processing was carried out according to the national standard (GB/T454-1989).
2. Compound surface sizing
The samples prepared in examples 1 to 6 were respectively marked as samples 1 to 6, and were respectively compounded with polyvinyl alcohol (PVA) to be used as a surface sizing agent, and the results after sizing paper were compared with the results after compounding modified starch with PVA under the same conditions and at the same concentrations, and are shown in the following table.
Table 2 shows the sizing effect of the paper after the compound sizing agent and the modified starch are compounded and sized
The method for testing the sizing degree of paper adopts an ink marking method (GB/T460-2002)
Sizing degree: the standard is specifically designed to measure the water resistance of paper and paperboard by the ink marking width, and is expressed by the maximum line width millimeter of the non-diffusion and non-permeability of the standard ink when marking on the surface of the paper and paperboard. The smaller the width, the greater the liquid penetration resistance, the greater the sizing degree.
The instrument adopted by the national standard (GB/T458-1989) for the air permeability of the paper is a Shoebur air permeability instrument.
3. Coating adhesive
The coated paper is used as an important variety of coated paper, when coated paper is produced, the product is added into a coating as an adhesive, mixed with pigment, inorganic filler and other additives to be used as a coating, uniformly coated on the surface of the paper by adopting a scraper coater, and dried. Compared with paper coated with the coating without the product, the paper coated with the coating has balanced gloss, high paper smoothness, better gloss, no hair and powder falling and coating peeling phenomena, greatly improved printability, no yellowing after long-time placement and bright appearance.
In conclusion, the acetoacetic acid group connected to the modified sodium carboxymethylcellulose prepared by the invention has high activity because the methylene in the middle is influenced by the electron withdrawing of two carbonyl groups, so that the modified sodium carboxymethylcellulose can be used as various additives. In the invention, sodium bisulfite is used as a reducing agent to reduce the activation energy of potassium persulfate, and S0 generated by hydrolysis, ionization and other reactions is added firstly4 2—And OH free radical initiates carboxymethyl cellulose to generate primary free radical, and then graft copolymerization with diketene is carried out. The invention can be used as sizing material and reinforcing agent in paper industry, can increase filler retention, can be compounded with other sizing agents to prepare surface sizing of paper, and can obviously improve the dry strength, wet strength, oil resistance, ink absorption and water resistance of the paper.
The modified CMC can be widely applied to various industries by adjusting the molecular weight of the modified CMC due to different grafting ratios and different degrees of substitution of the CMC during preparation. The modified CMC with relatively small molecular weight (15000-20000) prepared by the method has a good application effect particularly in the paper industry.
When the invention is used as a papermaking reinforcing agent, the combination quantity of hydrogen bonds in the intersection area of the fibers is greatly increased due to the bridging capacity of the connected acetoacetic acid groups in the product. Because a large amount of hydroxyl in the cellulose can enable the product to be firmly adsorbed on the fiber, the hydroxyl of the cellulose and the hydroxyl on the surface of the fiber form hydrogen bonds, and the bonding strength inside the fiber is increased.
The invention is added into the pulp to contact with aluminum sulfate in the pulp to precipitate on the fiber, which is helpful for improving the dry strength of paper and improving the retention of fine fiber and the dehydration of paper.
The rosin size can be compounded in the paper making industry to be used for paper sizing, namely the rosin size can be used as an auxiliary emulsifier to improve the stability of the rosin size, and the rosin size emulsion can not deteriorate and precipitate in summer when the water temperature is higher.
When the invention is used for sizing paper making, a tough coating film which can not penetrate grease can be generated on paper surface, air holes of the paper can be obviously reduced, and the invention is particularly suitable for surface sizing of oilproof paper, wax paper and the like.
When the invention is used as a papermaking coating adhesive, the grafted acetoacetic acid radical plays a role in bonding pigment particles and pigment and base paper, thereby improving the rheological property and stability of the coating, controlling the absorptivity of the coating to ink and improving the gloss of a printing surface.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (6)
1. A preparation method of a sodium carboxymethylcellulose-diketene graft copolymer is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
dissolving carboxymethyl cellulose: dissolving carboxymethyl cellulose in water;
condensing and refluxing: under the protection of inert gas, carrying out condensation reflux;
adding an initiator: adding initiators of potassium persulfate and sodium bisulfite, wherein the mass ratio of the potassium persulfate: sodium bisulfite ═ 2: 1-4;
grafting monomer: adding monomer diketene, and reacting;
wherein the initiator is added, the reaction temperature is 35-45 ℃, and the addition amount of the initiator is 0.01g of the initiator added to every 2.5g of the carboxymethyl cellulose;
the grafting monomer comprises monomer diketene of 0.5-1.0 g added into 2.5g of carboxymethyl cellulose, the reaction temperature is 35-45 ℃, and the reaction lasts for 3-4 h at the rotating speed of 100-200 rpm.
2. The method of claim 1, wherein: dissolving carboxymethyl cellulose, namely dissolving 2.5g of carboxymethyl cellulose in 500mL of water, and rapidly stirring to dissolve the carboxymethyl cellulose at the temperature of 50-60 ℃.
3. The method of claim 1, wherein: dissolving the carboxymethyl cellulose, and adjusting the pH value to 7-8 after dissolving the carboxymethyl cellulose in water.
4. The method of claim 1, wherein: the condensing reflux, wherein the inert gas comprises nitrogen.
5. The method of claim 1, wherein: and further comprising the steps of cooling to room temperature after the grafting monomer reaction is finished, washing with ethanol, carrying out vacuum filtration, washing again with deionized water, and drying.
6. The application of the sodium carboxymethylcellulose-diketene graft copolymer prepared by the preparation method of any one of claims 1 to 5 is characterized in that: the sodium carboxymethylcellulose-diketene graft copolymer can be used as a papermaking reinforcing agent, a sizing agent and a coating adhesive.
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